1998

5.7

1977

6.5

1989

5.4

1975

4.7

2009

5.5

1954

7.1

1982

5.3

2008

6.3

1951

6.3

1988

5.9

2003

7.2

1990

5.1

1947

7.0

2008

5.7

1991

6.3

1987

6.5

1983

5.8

1983

5.7

1986

6.7

1993

6.7